/Engine/Source/Editor/KismetCompiler/Public/KismetCompiler.h
Checks a connection response, and errors if it didn't succeed (not public, users should be using MovePinLinksToIntermediate/CopyPinLinksToIntermediate instead of wrapping their own with this).
void CheckConnectionResponse ( const [FPinConnectionResponse](API\Runtime\Engine\EdGraph\FPinConnectionResponse) & Response, const [UEdGraphNode](API\Runtime\Engine\EdGraph\UEdGraphNode) * Node )